$20 sounds like $200
TLDR: Try finding better $20-30 headphones shipped anywhere else
I had yet to put in a cheap pair of earbuds and say "wow, this sounds good." Thats my first impression of the E500. These sound better than most highly rated in-ears before the $200 mark. Having listened to 80% of final audio design's in-ears I can still strongly recommend these against their other offerings for a product to pick up where these are lacking... lets get into it.
-Strong construction, strong abs housing, and strain relief plug
-extended full frequency response, with clean bass extension and spl (for 6.5mm drivers)
-no resonant peaks* however everyone's ears are different but i am usually sensitive to sibilance
-large stereo spacing included with its binaural tuning (i'd guess its some phasing and lfo tweaks)
-fun, but neutral eq tuning, sub bass bump and clear lower highs with decently bright highs, (subtle V shape)
Cons: (not really)
-you get what you pay for, basic get the job done design but done right!
-no case, no comply tips (most audiophiles have extra, not a big deal)
-not built for isolation but music will be loud enough to drown out background most the time when using them
Overall, would recommend these to any and everyone you needs or wants a new budget set of earbuds. I keep them in my jacket pocket everywhere I go for work and casual listening. I will still trade off using these with my RHA T20i which I also like to bring sometimes. If you like them and are curious what Final audio has to offer check out the Piano Forte series for classical acoustic listeners and the F-series or Heaven series for more serious buyers.
Would recommend to a friend.